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audit5_summ.pl
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audit5_summ.pl
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#!/usr/bin/perl
#
# name : audit5_summ.pl
# FUNCTION: Summarise results from audit5.sh on several machines.
# We ignore multiple ICMP & tcp sessions with same from/to IP.
# UDP: ignore multiple packets to ports 514|53|123 with same from/to IP.
#
# USAGE: cat audit5_*summary.log| ./audit5_summ.pl
# results are written to $matrix1='audit5.csv', and can be opened in Excel.
#
# History :
# 2005.8.12/sb First version, Sean Boran
#
# TESTED ON: Solaris 8
#
# Possible improvements for future:
# Create detailed log with timestamps, "session" counts etc.
# Output to mysql to allow extensive querying of results
#
##################
$debug =''; # '1'=debug (useful), ''=no debug (quiet)
$services_file='/etc/services'; #
$matrix1='audit5.csv'; # file name for list of active servers
# --- perl security precautions ---
$ENV{'PATH'} = '/usr/bin:/usr/sbin:/bin:/sbin:/usr/etc';
$ENV{'SHELL'} = '/bin/sh';
$ENV{'IFS'} = '';
umask(077); # -rw-------
$os=`uname -r`; # Get OS revision
$os_name=`uname -s`; # Get OS name
#print "uname -s returns $os_name\n" if $debug;
#goto SKIP;
if ( -s "services" ) { # found local services
$services_file='./services';
} else {
$services_file='/etc/services';
}
print "Using $services_file for portname lookup.\n";
## Read in a service definiton file
open(F, "<$services_file");
while($line = <F>) {
chop($line);
#print "LINE: $line\n";
if ($line =~ /^#/) {
; # skip comments
} elsif ($line =~ /^(\S+)\s+(\d+)\/(tcp|udp)\s+(\S+)\s+#(.*)/) {
## First Format:
## systat 11/tcp users # Active Users
$proto=uc($3); # Uppercase
#print "Name=$1,Port=$2,Proto=$proto,Comment=$5\n";
# store port name in $services[proto][port_no]
if (! defined( $services{$proto}{$2}{'name'} )) {
$services{$proto}{$2}{'name'}=$1;
}
if (! defined( $services{$proto}{$2}{'comment'} )) {
$services{$proto}{$2}{'comment'}=$5;
}
} elsif ($line =~ /^(\S+)\s+(\d+)\/(tcp|udp)\s+# *(.*)$/) {
## 2nd Format:
## telnet 23/tcp # Telnet
$proto=uc($3); # Uppercase
#print "Name=$1,Port=$2,Proto=$proto,Comment=$4\n";
# store port name in $services[proto][port_no]
if (! defined( $services{$proto}{$2}{'name'} )) {
$services{$proto}{$2}{'name'}=$1;
}
if (! defined( $services{$proto}{$2}{'comment'} )) {
$services{$proto}{$2}{'comment'}=$5;
}
} elsif ($line =~ /^(\S+)\s+(\d+)\/(tcp|udp).*/) {
## 3nd Format:
## ftp-data 20/tcp
$proto=uc($3); # Uppercase
#print "Name=$1,Port=$2,Proto=$proto\n";
# store port name in $services[proto][port_no]
if (! defined( $services{$proto}{$2}{'name'} )) {
$services{$proto}{$2}{'name'}=$1;
}
} else {
# Stuff like sctp,ddp,tdp will be left
#print "Services not parsed: $line\n";
}
next;
} # finished reading input
close(F);
SKIP:
## Main loop from stdin
while($line = <STDIN>) {
chop($line);
## build matrix
#if ($line =~ /(icmp|ICMP|tcp|TCP|UDP|udp)/) {
## TCP
if ($line =~ /(tcp|TCP)/) { # TCP is special
@fields = split(/;/, $line);
#host5;SunOS;5.9;tcp;10.5.233.53.22706;10.5.227.11.3813
$proto_s=$fields[3];
@from_fields = split(/\./, $fields[4]);
@to_fields = split(/\./, $fields[5]);
$from="$from_fields[0].$from_fields[1].$from_fields[2].$from_fields[3]";
$to ="$to_fields[0].$to_fields[1].$to_fields[2].$to_fields[3]";
$from_port=$from_fields[4];
$to_port =$to_fields[4];
# Find duplicates: have there been other packets where $to;$to_port;$from
# are the same? Only from_port differs, i.e. we've seen this already?
# Examine $from_port because the packets we recorded are SYN-ACK replies
# (see audit5.sh).
$session_id="$to;$from;$from_port"; # usual case
$session_id2="$to;$from;$to_port"; # reverse connections, e.g. FTP/20
if ( defined $tcp_session{$session_id} ) {
$tcp_session{$session_id}++;
if ($tcp_session{$session_id}==2) { # Debugging: note once
print "Ignoring multiple tcp session: $fields[0];$fields[1];$fields[2];TCP;$to;$to_port;$from;$from_port;$tcp_session{$session_id}\n" if $debug;
}
} elsif ($to_port eq "20") { # reduce reverse FTP data connections
if ( defined $tcp_session{$session_id2} ) {
print "Ignoring multiple tcp FTP session: $fields[0];$fields[1];$fields[2];TCP;$to;$to_port;$from;$from_port;$tcp_session{$session_id2}\n" if $debug;
} else {
$tcp_session{$session_id2}=1;
push @established, "$fields[0];$fields[1];$fields[2];TCP;$to;20 ftp-data;$from;\n";
}
} else {
$tcp_session{$session_id}=1;
## OK, save this session:
# Reverse the from/to since we recorded SYN-ACKs which is the reply
# packet to initial session request
#push @established, "$fields[0];$fields[1];$fields[2];TCP;$to;$to_port;$from;$from_port\n";
$to_p=$to_port .' ' .$services{'TCP'}{$to_port}{'name'}
.' ' .$services{$proto_s}{$to_port}{'comment'};
$from_p=$from_port .' ' .$services{'TCP'}{$from_port}{'name'}
.' ' .$services{$proto_s}{$from_port}{'comment'};;
push @established, "$fields[0];$fields[1];$fields[2];TCP;$to;$to_p;$from;$from_p\n";
}
## ICMP
} elsif ($line =~ /(icmp|ICMP)/) {
@fields = split(/;/, $line);
#host1;SunOS;5.8;ICMP;10.176.214.30;10.5.238.99
$proto_s=$fields[3];
@from_fields = split(/\./, $fields[4]);
@to_fields = split(/\./, $fields[5]);
$from="$from_fields[0].$from_fields[1].$from_fields[2].$from_fields[3]";
$to ="$to_fields[0].$to_fields[1].$to_fields[2].$to_fields[3]";
$from_port=$from_fields[4];
$to_port =$to_fields[4];
# Find duplicates: have there been other ICMP packets where $to;$from
# are the same? i.e. we've seen this already?
$session_id="$to;$from";
$session_id2="$from;$to";
if ( defined $icm_session{$session_id} ) {
$icm_session{$session_id}++;
if ($icm_session{$session_id}==2) { # Debugging: note once
print "Ignoring ICMP: $fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port;$icm_session{$session_id}\n" if $debug;
}
} elsif ( defined $icm_session{$session_id2} ) {
# Were there already packets in the other direction?
print "Ignoring ICMP reverse: $proto_s;$from;$from_port;$to;$to_port;$udp_session{$session_id}\n" if $debug;
} else {
$icm_session{$session_id}=1;
## OK, save this packet:
#push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port\n";
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;;$to;\n";
}
## UDP
} elsif ($line =~ /(UDP|udp)/) {
@fields = split(/;/, $line);
#host2;SunOS;5.8;UDP;10.32.17.13.123;10.5.238.99.123
#print "Established $proto_s Fields: $fields[1], $fields[2]\n";
$proto_s=$fields[3];
@from_fields = split(/\./, $fields[4]);
@to_fields = split(/\./, $fields[5]);
$from="$from_fields[0].$from_fields[1].$from_fields[2].$from_fields[3]";
$to ="$to_fields[0].$to_fields[1].$to_fields[2].$to_fields[3]";
$from_port=$from_fields[4];
$to_port =$to_fields[4];
## Reduce standard well-known UDP ports: syslog,ntp,snmp,dns,netbios,nfs
if ($to_port =~ /^(53|111|123|161|162|514|137|139|2049)$/) {
# Find duplicates: have there been other packets where $to;$from
# are the same? i.e. we've seen this already?
$session_id="$to;$from;$to_port"; # one direction
$session_id2="$from;$to;$from_port"; # the other
if ( defined $udp_session{$session_id} ) {
$udp_session{$session_id}++;
if ($udp_session{$session_id}==2) { # Debugging: note once
print "Ignoring multiple UDP: $fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port;$udp_session{$session_id}\n" if $debug;
}
} elsif ( defined $udp_session{$session_id2} ) {
# Were there already packets in the other direction?
print "Ignoring UDP reverse: $proto_s;$from;$from_port;$to;$to_port;$udp_session{$session_id}\n" if $debug;
} else {
# never been seen before, save this packet:
$udp_session{$session_id}=1;
$to_p=$to_port .' ' .$services{'UDP'}{$to_port}{'name'}
.' ' .$services{$proto_s}{$to_port}{'comment'};
$from_p=$from_port .' ' .$services{'UDP'}{$from_port}{'name'}
.' ' .$services{$proto_s}{$from_port}{'comment'};;
#push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port\n";
# Don't print the from_port if its a high port
if ($from_port eq $to_port) {
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_p;$to;$to_p\n";
} else {
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;;$to;$to_p\n";
}
}
## Reduce standard well-known UDP ports: syslog,ntp,snmp,dns
} elsif ($from_port =~ /^(53|111|123|161|514|137|139|2049)$/) {
# Find duplicates: have there been other packets where $to;$from
# are the same? i.e. we've seen this already?
$session_id2="$to;$from;$to_port"; # one direction
$session_id="$from;$to;$from_port"; # the other
if ( defined $udp_session{$session_id} ) {
$udp_session{$session_id}++;
if ($udp_session{$session_id}==2) { # Debugging: note once
print "Ignoring multiple UDP: $fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port;$udp_session{$session_id}\n" if $debug;
}
} elsif ( defined $udp_session{$session_id2} ) {
# Were there already packets in the other direction?
print "Ignoring UDP reverse: $proto_s;$from;$from_port;$to;$to_port;$udp_session{$session_id}\n" if $debug;
} else {
$udp_session{$session_id}=1;
## OK, save this packet:
$to_p=$to_port .' ' .$services{'UDP'}{$to_port}{'name'}
.' ' .$services{$proto_s}{$to_port}{'comment'};
$from_p=$from_port .' ' .$services{'UDP'}{$from_port}{'name'}
.' ' .$services{$proto_s}{$from_port}{'comment'};;
#push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port\n";
# Don't print the to_port if its a high port
if ($from_port eq $to_port) {
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_p;$to;$to_p\n";
} else {
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_p;$to;\n";
}
}
} else {
# other UDP protocol
push @established, "$fields[0];$fields[1];$fields[2];$proto_s;$from;$from_port;$to;$to_port\n";
}
} # if line (protocol)
next;
} # finished reading input
#foreach $p (sort keys %mat) {
# print "Port $p\n";
#}
####### now print analysis
print ("Writing Active matrix to: $matrix1\n");
open(F, ">$matrix1");
print F "Host;OS;OS-version;Proto;From IP;From Port;To IP;To Port\n";
foreach $line (sort @established) {
print F $line;
}
close(F);
#eof