640 lines
17 KiB
Perl
640 lines
17 KiB
Perl
#!/usr/local/bin/perl
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# (C) Copyright 1998 Ivan S. Bishop (isb@notoryus.genmagic.com)
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#
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############### START SUBROUTINE DECLARATIONS ###########
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sub usage {
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print "\n" x 24;
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print "USAGE: ipfanalyze.pl -h [-p port# or all] [-g] [-s] [-v] [-o] portnum -t [target ip address] [-f] logfilename\n";
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print "\n arguments to -p -f -o REQUIRED\n";
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print "\n -h show this help\n";
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print "\n -p limit stats/study to this port number.(eg 25 not smtp)\n";
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print " -g make graphs, one per 4 hour interval called outN.gif 1<=N<=5\n";
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print " -s make security report only (no graphical or full port info generated) \n";
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print " -o lowest port number incoming traffic can talk to and be regarded as safe\n";
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print " -v verbose report with graphs and textual AND SECURITY REPORTS with -o 1024 set\n";
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print " -t the ip address of the inerface on which you collected data!\n";
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print " -f name ipfilter log file (compatible with V 3.2.9) [ipfilter.log]\n";
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print " \nExample: ./ipfanalyze.pl -p all -g -f log1\n";
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print "Will look at traffic to/from all ports and make graphs from file log1\n";
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print " \nExample2 ./ipfanalyze.pl -p 25 -g -f log2\n";
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print "Will look at SMTP traffic and make graphs from file log2\n";
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print " \nExample3 ./ipfanalyze.pl -p all -g -f log3 -o 1024\n";
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print "Will look at all traffic,make graphs from file log3 and log security info for anthing talking inwards below port 1024\n";
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print " \nExample4 ./ipfanalyze.pl -p all -f log3 -v \n";
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print "Report the works.....when ports below 1024 are contacted highlight (like -s -o 1024)\n";
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}
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sub makegifs {
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local ($maxin,$maxout,$lookat,$xmax)=@_;
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$YMAX=$maxin;
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$XMAX=$xmax;
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if ($maxout > $maxin)
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{ $YMAX=$maxout;}
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($dateis,$junk)=split " " , @recs[0];
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($dayis,$monthis,$yearis)=split "/",$dateis;
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$month=$months{$monthis};
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$dateis="$dayis " . "$month " . "$yearis ";
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# split graphs in to 6 four hour spans for 24 hours
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$numgraphs=int($XMAX/240);
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$junk=0;
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$junk=$XMAX - 240*($numgraphs);
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if($junk gt 0 )
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{
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$numgraphs++;
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}
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$cnt1=0;
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$end=0;
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$loop=0;
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while ($cnt1++ < $numgraphs)
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{
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$filename1="in$cnt1.dat";
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$filename2="out$cnt1.dat";
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$filename3="graph$cnt1.conf";
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open(OUTDATA,"> $filename2") || die "Couldnt open $filename2 for writing \n";
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open(INDATA,"> $filename1") || die "Couldnt open $filename1 for writing \n";
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$loop=$end;
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$end=($end + 240);
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# write all files as x time coord from 1 to 240 minutes
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# set hour in graph via conf file
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$arraycnt=0;
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while ($loop++ < $end )
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{
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$arraycnt++;
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$val1="";
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$val2="";
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$val1=$inwards[$loop] [1];
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if($val1 eq "")
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{$val1=0};
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$val2=$outwards[$loop] [1];
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if($val2 eq "")
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{$val2=0};
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print INDATA "$arraycnt:$val1\n";
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print OUTDATA "$arraycnt:$val2\n";
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}
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close INDATA;
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close OUTDATA;
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$gnum=($cnt1 - 1);
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open(INCONFIG,"> $filename3") || die "Couldnt open ./graph.conf for writing \n";
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print INCONFIG "NUMBERYCELLGRIDSIZE:5\n";
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print INCONFIG "MAXYVALUE:$YMAX\n";
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print INCONFIG "MINYVALUE:0\n";
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print INCONFIG "XCELLGRIDSIZE:1.3\n";
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print INCONFIG "XMAX: 240\n";
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print INCONFIG "Bar:0\n";
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print INCONFIG "Average:0\n";
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print INCONFIG "Graphnum:$gnum\n";
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print INCONFIG "Title: port $lookat packets/minute to/from gatekeep on $dateis \n";
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print INCONFIG "Transparent:no\n";
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print INCONFIG "Rbgcolour:0\n";
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print INCONFIG "Gbgcolour:255\n";
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print INCONFIG "Bbgcolour:255\n";
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print INCONFIG "Rfgcolour:0\n";
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print INCONFIG "Gfgcolour:0\n";
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print INCONFIG "Bfgcolour:0\n";
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print INCONFIG "Rcolour:0\n";
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print INCONFIG "Gcolour:0\n";
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print INCONFIG "Bcolour:255\n";
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print INCONFIG "Racolour:255\n";
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print INCONFIG "Gacolour:255\n";
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print INCONFIG "Bacolour:0\n";
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print INCONFIG "Rincolour:100\n";
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print INCONFIG "Gincolour:100\n";
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print INCONFIG "Bincolour:60\n";
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print INCONFIG "Routcolour:60\n";
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print INCONFIG "Goutcolour:100\n";
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print INCONFIG "Boutcolour:100\n";
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close INCONFIG;
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}
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$cnt1=0;
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while ($cnt1++ < $numgraphs)
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{
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$filename1="in$cnt1.dat";
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$out="out$cnt1.gif";
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$filename2="out$cnt1.dat";
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$filename3="graph$cnt1.conf";
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system( "cp ./$filename1 ./in.dat;
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cp ./$filename2 ./out.dat;
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cp ./$filename3 ./graph.conf");
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system( "./isbgraph -conf graph.conf;mv graphmaker.gif $out");
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system(" cp $out /isb/local/etc/httpd/htdocs/.");
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}
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} # end of subroutine make gifs
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sub packbytime {
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local ($xmax)=@_;
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$XMAX=$xmax;
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# pass in the dest port number or get graph for all packets
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# at 1 minute intervals
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# @shortrecs has form 209.24.1.217 123 192.216.16.2 123 udp len 20 76
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# @recs has form 27/07/1998 00:01:05.216596 le0 @0:2 L 192.216.21.16,2733 -> 192.216.16.2,53 PR udp len 20 62
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#
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# dont uses hashes to store how many packets per minite as they
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# return random x coordinate order
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@inwards=();
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@outwards=();
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$cnt=-1;
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$value5=0;
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$maxin=0;
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$maxout=0;
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$xpos=0;
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while ($cnt++ <= $#recs )
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{
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($srcip,$srcport,$destip,$destport,$pro)= split " " , @shortrecs[$cnt];
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$bit=substr(@recs[$cnt],11);
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($bit,$junkit)= split " " , $bit ;
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($hour,$minute,$sec,$junk) = split ":", $bit;
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#
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# covert the time to decimal minutes and bucket to nearest minute
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#
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$xpos=($hour * 3600) + ($minute * 60) + ($sec) ;
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# xpos is number of seconds since 00:00:00 on day......
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$xpos=int($xpos / 60);
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# if we just want to see all packet in/out activity
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if("$lookat" eq "all")
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{
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if("$destip" eq "$gatekeep")
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{
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# TO GATEKEEP port lookat
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# print "to gatekeep at $xpos\n";
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$value5=$inwards[$xpos] [1];
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$value5++ ;
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# $maxin = $value5 if $maxin < $value5 ;
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if($value5 > $maxin)
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{
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$maxin=$value5;
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$timemaxin="$hour:$minute";
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}
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$inwards[$xpos][1]=$value5;
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}
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else
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{
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# FROM GATEKEEP to port lookat
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# print "from gatekeep at $xpos\n";
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$value4=$outwards[$xpos] [1];
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$value4++ ;
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# $maxout = $value4 if $maxout < $value4 ;
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if($value4 > $maxout)
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{
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$maxout=$value4;
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$timemaxout="$hour:$minute";
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}
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$outwards[$xpos][1]=$value4;
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}
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}
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if("$destport" eq "$lookat")
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{
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if("$destip" eq "$gatekeep")
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{
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# TO GATEKEEP port lookat
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# print "to gatekeep at $xpos\n";
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$value5=$inwards[$xpos] [1];
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$value5++ ;
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$maxin = $value5 if $maxin < $value5 ;
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$inwards[$xpos][1]=$value5;
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}
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else
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{
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# FROM GATEKEEP to port lookat
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# print "from gatekeep at $xpos\n";
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$value4=$outwards[$xpos] [1];
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$value4++ ;
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$maxout = $value4 if $maxout < $value4 ;
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$outwards[$xpos][1]=$value4;
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}
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}
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} # end while
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# now call gif making stuff
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if("$opt_g" eq "1")
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{
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print "Making plots of in files outN.gif\n";;
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makegifs($maxin,$maxout,$lookat,$#inwards);
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}
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if ("$timemaxin" ne "")
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{print "\nTime of peak packets/minute in was $timemaxin\n";}
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if ("$timemaxout" ne "")
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{print "\nTime of peak packets/minute OUT was $timemaxout\n";}
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} # end of subroutine packets by time
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sub posbadones {
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$safenam="";
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@dummy=$saferports;
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foreach $it (split " ",$saferports) {
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if ($it eq "icmp" )
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{
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$safenam = $safenam . " icmp";
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}
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else
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{
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$safenam = $safenam . " $services{$it}" ;
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}
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}
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print "\n\n########################################################################\n";
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print "well known ports are 0->1023\n";
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print "Registered ports are 1024->49151\n";
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print "Dynamic/Private ports are 49152->65535\n\n";
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print "Sites that contacted gatekeep on 'less safe' ports (<$ITRUSTABOVE)\n";
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print " 'safe' ports are $safenam \n";
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print "\n variables saferports and safehosts hardwire what/who we trust\n";
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print "########################################################################\n";
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$loop=-1;
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while ($loop++ <= $#recs )
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{
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($srcip,$srcport,$destip,$destport,$pro)= split " " , @shortrecs[$loop];
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if ("$destip" eq "$gatekeep")
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{
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if ($destport < $ITRUSTABOVE )
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{
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# if index not found (ie < 0) then we have a low port attach to gatekeep
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# that is not to a safer port (see top of this file)
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# ie no ports 25 (smtp), 53 (dns) , 113 (ident), 123 (ntp), icmp
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$where=index($saferports,$destport);
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if ($where < 0)
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{
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$nameis=$services{$destport};
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if ("$nameis" eq "" )
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{
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$nameis=$destport;
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}
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print " Warning: $srcip contacted gatekeep $nameis\n";
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}
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}
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}
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}
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print "\n\n";
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} # end of subroutine posbadones
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sub toobusy_site {
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$percsafe=1;
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print "\n\n########################################################################\n";
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print "# Sites sending > $percsafe % of all packets to gatekeep MAY be attacking/probing\n";
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print "Trusted hosts are $safehosts\n";
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print "\nTOTAL packets were $#recs \n";
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print "########################################################################\n";
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while(($ipadd,$numpacketsent)=each %numpacks)
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{
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$perc=$numpacketsent/$#recs*100;
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if ($perc > $percsafe)
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# dont believe safehosts are attacking!
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{
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$where=index($safehosts,$ipadd);
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# if not found (ie < 0 then the source host IP address
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# isn't in the saferhosts list, a list we trust......
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if ($where < 0 )
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{
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printf "$ipadd sent %4.1f (\045) of all packets to gatekeep\n",$perc;
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}
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}
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}
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print "\n\n";
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} # end of subroutine toobusy_site
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############### END SUBROUTINE DECLARATIONS ###########
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use Getopt::Std;
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getopt('pfot');
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if("$opt_t" eq "0")
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{usage;print "\n---->ERROR: You must psecify the IP address of the interface that collected the data!\n";
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exit;
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}
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if("$opt_h" eq "1")
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{usage;exit 0};
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if("$opt_H" eq "1")
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{usage;exit 0};
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if("$opt_v" eq "1")
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{
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$ITRUSTABOVE=1024;
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$opt_s=1;
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$opt_o=$ITRUSTABOVE;
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print "\n" x 5;
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print "NOTE: when the final section of the verbose report is generated\n";
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print " every host IP address that contacted $gatekeep has \n";
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print " a tally of how many times packets from a particular port on that host\n";
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print " reached $gatekeep, and WHICH source port or source portname \n";
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print " these packets originated from.\n";
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print " Many non RFC obeying boxes do not use high ports and respond to requests from\n";
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print " $gatekeep using reserved low ports... hence you'll see things like\n";
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print " #### with 207.50.191.60 as the the source for packets ####\n";
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print " 1 connections from topx to gatekeep\n\n\n\n";
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}
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if("$opt_o" eq "")
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{usage;print "\n---->ERROR: Must specify lowest safe port name for incoming trafic\n";exit 0}
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else
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{
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$ITRUSTABOVE=$opt_o;$opt_s=1;}
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if("$opt_f" eq "")
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{usage;print "\n---->ERROR: Must specify filename with -f \n";exit 0};
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$FILENAME=$opt_f;
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if("$opt_p" eq "")
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{usage;print "\n---->ERROR: Must specify port number or 'all' with -p \n";exit 0};
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# -p arg must be all or AN INTEGER in range 1<=N<=64K
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if ("$opt_p" ne "all")
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{
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$_=$opt_p;
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unless (/^[+-]?\d+$/)
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{
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usage;
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print "\n---->ERROR: Must specify port number (1-64K) or 'all' with -p \n";
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exit 0;
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}
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}
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# if we get here then the port option is either 'all' or an integer...
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# good enough.....
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$lookat=$opt_p;
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# -o arg must be all or AN INTEGER in range 1<=N<=64K
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$_=$opt_o;
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unless (/^[+-]?\d+$/)
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{
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usage;
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print "\n---->ERROR: Must specify port number (1-64K) with -o \n";
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exit 0;
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}
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#---------------------------------------------------------------------
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%danger=();
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%numpacks=();
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$saferports="25 53 113 123 icmp";
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$gatekeep="192.216.16.2";
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#genmagic is 192.216.25.254
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$safehosts="$gatekeep 192.216.25.254";
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# load hash with service numbers versus names
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# hash called $services
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print "Creating hash of service names / numbers \n";
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$SERV="./services";
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open (INFILE, $SERV) || die "Cant open $SERV: $!n";
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while(<INFILE>)
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{
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($servnum,$servname,$junk)=split(/ /,$_);
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# chop off null trailing.....
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$servname =~ s/\n$//;
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$services{$servnum}=$servname;
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}
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print "Create hash of month numbers as month names\n";
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%months=("01","January","02","February","03","March","04","April","05","May","06","June","07","July","08","August","09","September","10","October","11","November","12","December");
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print "Reading log file into an array\n";
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#$FILENAME="./ipfilter.log";
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open (REC, $FILENAME) || die "Cant open $FILENAME: \n";
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($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$junk)=stat REC;
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print "Log file $FILENAME is $size bytes in size\n";
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#each record is an element of array rec[] now
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while(<REC>)
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{
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@recs[$numrec++]=$_;
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}
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# get list of UNIQUE source IP addresses now, records look like
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# 192.216.25.254,62910 -> 192.216.16.2,113 PR tcp len 20 40 -R
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# this is slow on big log files, about 1minute for every 2.5M log file
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print "Making list of unique source IP addresses (1minute for every 2M log parsed)\n";
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$loop=-1;
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$where=-1;
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while ($loop++ < $#recs )
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{
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# get the LHS = source IP address, need fiddle as icmp rcords are logged oddly
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$bit=substr(@recs[$loop],39);
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$bit =~ s/,/ /g;
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($sourceip,$junkit)= split " " , $bit ;
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# NOTE the . is the string concat command NOT + .......!!!!
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$sourceip =~ split " ", $sourceip;
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$where=index($allips,$sourceip);
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# if not found (ie < 0, add it)
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if ($where < 0 )
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{
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$allips = $allips . "$sourceip " ;
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}
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}
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print "Put all unique ip addresses into a 1D array\n";
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@allips=split " ", $allips;
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#set loop back to -1 as first array element in recs is element 0 NOT 1 !!
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print "Making compact array of logged entries\n";
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$loop=-1;
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$icmp=" icmp ";
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$ptr=" -> ";
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$lenst=" len ";
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$numpackets=0;
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while ($loop++ < $#recs )
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{
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# this prints from 39 char to EOR
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$a=substr(@recs[$loop],39);
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($srcip,$dummy,$destip,$dummy2,$dummy3,$dummy4,$lenicmp)= split " " , $a ;
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# need to rewrite icmp ping records.... they dont have service numbers
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$whereicmp=index($a,"PR icmp");
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if($whereicmp > 0 )
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{
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$a = $srcip . $icmp . $ptr . $destip . $icmp . $icmp . $lenst . $lenicmp ;
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}
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# dump the "->" and commas from logging
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$a =~ s/->//g;
|
|
$a =~ s/PR//g;
|
|
$a =~ s/,/ /g;
|
|
# shortrec has records that look like
|
|
# 209.24.1.217 123 192.216.16.2 123 udp len 20 76
|
|
@shortrecs[$loop]= "$a";
|
|
|
|
# count number packets from each IP address into hash
|
|
($srcip,$junk) = split " ","$a";
|
|
$numpackets=$numpacks{"$srcip"};
|
|
$numpackets++ ;
|
|
$numpacks{"$srcip"}=$numpackets;
|
|
|
|
}
|
|
|
|
|
|
|
|
# call sub to analyse packets by time
|
|
# @shortrecs has form 209.24.1.217 123 192.216.16.2 123 udp len 20 76
|
|
# @recs has form 27/07/1998 00:01:05.216596 le0 @0:2 L 192.216.21.16,2733 -> 192.216.16.2,53 PR udp len 20 62
|
|
packbytime($XMAX);
|
|
|
|
if("$opt_s" eq "1")
|
|
{
|
|
# call subroutine to scan for connections to ports on gatekeep
|
|
# other than those listed in saferports, connections to high
|
|
# ports are assumed OK.....
|
|
posbadones;
|
|
|
|
# call subroutine to print out which sites had sent more than
|
|
# a defined % of packets to gatekeep
|
|
toobusy_site;
|
|
}
|
|
|
|
|
|
# verbose reporting?
|
|
if ("$opt_v" eq "1")
|
|
{
|
|
$cnt=-1;
|
|
# loop over ALL unique IP source destinations
|
|
while ($cnt++ < $#allips)
|
|
{
|
|
%tally=();
|
|
%unknownsrcports=();
|
|
$uniqip=@allips[$cnt];
|
|
$loop=-1;
|
|
$value=0;
|
|
$value1=0;
|
|
$value2=0;
|
|
$value3=0;
|
|
$set="N";
|
|
|
|
while ($loop++ < $#recs )
|
|
{
|
|
# get src IP num, src port number,
|
|
# destination IP num, destnation port number,protocol
|
|
($srcip,$srcport,$destip,$destport,$pro)= split " " , @shortrecs[$loop];
|
|
# loop over all records for the machine $uniqip
|
|
# NOTE THE STRINGS ARE COMPARED WITH eq NOT cmp and NOT = !!!!
|
|
if( "$uniqip" eq "$srcip")
|
|
{
|
|
# look up hash of service names to get key... IF ITS NOT THERE THEN WHAT???
|
|
# its more than likely a request coming back in on a high port
|
|
# ....So...
|
|
# find out the destination port from the unknown (high) src port
|
|
# and tally these as they may be a port attack
|
|
if ("$srcport" eq "icmp")
|
|
{ $srcportnam="icmp";}
|
|
else
|
|
{
|
|
$srcportnam=$services{$srcport};
|
|
}
|
|
# try and get dest portname, if not there, leave it as the
|
|
# dest portnumber
|
|
if ("$destport" eq "icmp")
|
|
{ $destportnam="icmp";}
|
|
else
|
|
{
|
|
$destportnam=$services{$destport};
|
|
}
|
|
|
|
if ($destportnam eq "")
|
|
{
|
|
$destportnam=$destport;
|
|
}
|
|
|
|
if ($srcportnam eq "")
|
|
{
|
|
# increment number of times a (high)/unknown port has gone to destport
|
|
$value1=$unknownsrcports{$destportnam};
|
|
$value1++ ;
|
|
$unknownsrcports{$destportnam}=$value1;
|
|
}
|
|
else
|
|
{
|
|
# want tally(srcport) counter to be increased by 1
|
|
$value3=$tally{$srcportnam};
|
|
$value3++ ;
|
|
$tally{$srcportnam}=$value3;
|
|
}
|
|
}
|
|
|
|
|
|
}
|
|
# end of loop over ALL IP's
|
|
|
|
if ($set eq "N")
|
|
{
|
|
$set="Y";
|
|
|
|
print "\n#### with $uniqip as the the source for packets ####\n";
|
|
while(($key,$value)=each %tally)
|
|
{
|
|
if (not "$uniqip" eq "$gatekeep")
|
|
{
|
|
print "$value connections from $key to gatekeep\n";
|
|
}
|
|
else
|
|
{
|
|
print "$value connections from gatekeep to $key\n";
|
|
}
|
|
}
|
|
|
|
|
|
|
|
while(($key2,$value2)=each %unknownsrcports)
|
|
{
|
|
if (not "$uniqip" eq "$gatekeep")
|
|
{
|
|
print "$value2 high port connections to $key2 on gatekeep\n";
|
|
}
|
|
else
|
|
{
|
|
print "$value2 high port connections to $key2 from gatekeep\n";
|
|
}
|
|
}
|
|
|
|
}
|
|
# print if rests for UNIQIP IF flag is set to N then toggle flag
|
|
|
|
} # end of all IPs loop
|
|
} # end of if verbose option set block
|
|
|
|
|
|
|