Raphaël G. Git Repositories - tools/blob - blacklist

   1 #! /usr/bin/perl
   2
   3 use strict;
   4 use warnings;
   5
   6 use IPC::System::Simple qw(capturex);
   7 use Data::Validate::IP;
   8
   9 my %ip4s = ();
  10 my %ip6s = ();
  11 my @blrule4s = ();
  12 my @blrule6s = ();
  13 my $whitelist = qr/^(?:127.|5.9.143.173|85.68.182.45|195.25.233.49|::1|2a01:4f8:190:22a6:)/;
  14 my @userlist = ('rapsys');
  15
  16 # Extract sshd.service scan
  17 map {
  18         if (/Failed password for (?:invalid user )?(.+) from (.+) port [0-9]+ ssh2/ && grep($_ ne $1, @userlist) && $2 !~ /$whitelist/) {
  19                 if (Data::Validate::IP::is_ipv4($2)) {
  20                         $ip4s{$2}=1;
  21                 } elsif (Data::Validate::IP::is_ipv6($2)) {
  22                         $ip6s{$2}=1;
  23                 }
  24         }
  25 } capturex('journalctl', '-u', 'sshd.service');
  26
  27 # Extract kernel port scan
  28 map {
  29         if (/Shorewall:net-fw:DROP:.* SRC=([^\s]+) DST=.*/ && $1 !~ /$whitelist/) {
  30                 if (Data::Validate::IP::is_ipv4($1)) {
  31                         $ip4s{$1}=1;
  32                 } elsif (Data::Validate::IP::is_ipv6($1)) {
  33                         $ip6s{$1}=1;
  34                 }
  35         }
  36 } capturex('journalctl', '-k');
  37
  38 # Open blrule4s file for reading
  39 open (my $fh, '<', '/etc/shorewall/blrules') or die "Can't open < /etc/shorewall/blrules: $!";
  40
  41 # Populate with comments
  42 @blrule4s = map { chomp($_); if (/^#/) { $_; } else { (); } } <$fh>;
  43
  44 # Prepend header
  45 push @blrule4s, "WHITELIST\tnet:5.9.143.173\tall";
  46 push @blrule4s, "WHITELIST\tnet:85.68.182.45\tall";
  47 push @blrule4s, "WHITELIST\tnet:195.25.233.49\tall";
  48
  49 # Build blacklist
  50 map { push @blrule4s, "DROP\t\tnet:".$_.(length lt 12?"\t":'')."\tfw"; } sort keys %ip4s;
  51
  52 # Close blrule4s file
  53 close $fh or die "Can't close fh: $!";
  54
  55 # Open blrule4s file for writing
  56 open ($fh, '>', '/etc/shorewall/blrules') or die "Can't open > /etc/shorewall/blrules: $!";
  57
  58 # Inject content of blacklist
  59 map { print $fh $_."\n"; } @blrule4s;
  60
  61 # Close blrule4s file
  62 close $fh or die "Can't close fh: $!";
  63
  64 # Print ipv6 to update hash
  65 #XXX; right now it don't seems scanned at all...
  66 for (sort keys %ip6s) {
  67         print $_."\n";
  68 }
  69
  70 # Restart shorewall service
  71 capturex('systemctl', 'restart', 'shorewall.service');