You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
3.7 KiB
132 lines
3.7 KiB
#!/usr/bin/perl -w
|
|
|
|
use strict;
|
|
use warnings;
|
|
use esmith::ConfigDB;
|
|
use Getopt::Long;
|
|
|
|
our $f2bdb = esmith::ConfigDB->open('fail2ban');
|
|
our $c = esmith::ConfigDB->open_ro;
|
|
our %opts;
|
|
|
|
|
|
sub usage(){
|
|
print<<"EOF";
|
|
|
|
Usage: $0 --host=<ip> [--unban] [--protocol=tcp|udp|icmp|all] [--port=<port number>] [--bantime]
|
|
|
|
* --host must specify a valid IPv4 adress in the form 10.11.12.13
|
|
* --protocol can be used to specify the protocol to block. Only tcp, udp, icmp and all are valid (default is all)
|
|
* --port can be used to specify the port(s) to block. Only valid for tcp and udp. You can also specify a range
|
|
of port like 10000:20000. You can also specify several ports or range of port separated by a comma
|
|
* if --unban is specified, the given host will be removed from the blacklist
|
|
default is to add to the blacklist instead
|
|
* --bantime can be used to specify how long the ban should be (in seconds)
|
|
|
|
EOF
|
|
}
|
|
|
|
# Check if port is valid
|
|
sub is_valid_port($){
|
|
my $ports = shift;
|
|
my $ret = 0;
|
|
foreach my $port (split /,/, $ports){
|
|
if ($port =~ m/^(\d+):(\d+)$/){
|
|
$ret = 1 if ($1 >= 0 &&
|
|
$1 < 65636 &&
|
|
$2 >= 0 &&
|
|
$2 < 65636);
|
|
}
|
|
else{
|
|
$ret = 1 if ($port > 0 &&
|
|
$port < 65636);
|
|
}
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
# Generate a random uniq ID
|
|
sub generate_uniq_id(){
|
|
my @chars = ('a'..'z','0'..'9');
|
|
my $id = '';
|
|
my $round = 0;
|
|
foreach (1..10){
|
|
foreach (1..15){
|
|
$id .= $chars[rand @chars];
|
|
}
|
|
my $eid = $f2bdb->get($id);
|
|
last unless ($eid);
|
|
}
|
|
die "Couldn't generate a valid uniq ID\n"
|
|
if ($id eq '');
|
|
return $id;
|
|
}
|
|
|
|
my $f2b = $c->get('fail2ban') ||
|
|
die "fail2ban service not found in the configuration database\n";
|
|
|
|
# default is to ban a host
|
|
$opts{unban} = '0';
|
|
$opts{bantime} = $f2b->prop('BanTime') || '1800';
|
|
|
|
GetOptions(
|
|
"host=s" => \$opts{host},
|
|
"unban" => \$opts{unban},
|
|
"protocol=s" => \$opts{proto},
|
|
"port=s" => \$opts{port},
|
|
"bantime=s" => \$opts{bantime}
|
|
);
|
|
|
|
# special "undef" value for port and proto
|
|
undef $opts{proto} if ($opts{proto} eq 'undef');
|
|
undef $opts{port} if ($opts{port} eq 'undef');
|
|
$opts{bantime} = ($f2b->prop('BanTime') || '1800')
|
|
if ($opts{bantime} eq 'undef');
|
|
|
|
# Check options are valid
|
|
|
|
# host is required
|
|
my @req = qw(host);
|
|
foreach (@req){
|
|
usage() && die unless (defined $opts{$_});
|
|
}
|
|
|
|
# host must look like an IP address
|
|
usage() && die
|
|
unless ($opts{host} =~ m/^(?:(?:[01]?\d?\d?|2[0-4]\d|25[0-5])(?:\.|$)){4}$/);
|
|
|
|
# protocol must can only be undefined, tcp, udp or icmp
|
|
usage() && die
|
|
if ($opts{proto} && $opts{proto} !~ m/^tcp|udp|icmp|all$/);
|
|
|
|
# port must be a valid port number, and is only valid for tcp and udp
|
|
usage && die
|
|
if ($opts{port} && (($opts{proto} && $opts{proto} !~ m/^tcp|udp$/) || !is_valid_port($opts{port})));
|
|
|
|
if ($opts{unban}){
|
|
foreach ($f2bdb->get_all_by_prop(Host => $opts{host})){
|
|
my $proto = $_->prop('Protocol') || '';
|
|
my $port = $_->prop('Port') || '';
|
|
next if ($opts{proto} && $proto ne $opts{proto});
|
|
next if ($opts{port} && $port ne $opts{port} && $proto =~ m/^tcp|udp$/);
|
|
$_->delete();
|
|
}
|
|
}
|
|
else{
|
|
my $id = generate_uniq_id();
|
|
$f2bdb->new_record($id, {type => 'ban'});
|
|
$f2bdb->set_prop($id, 'Host', $opts{host});
|
|
$f2bdb->set_prop($id, 'Protocol', $opts{proto})
|
|
if ($opts{proto});
|
|
$f2bdb->set_prop($id, 'Port', $opts{port})
|
|
if ($opts{port});
|
|
# Set the current timestamp
|
|
$f2bdb->set_prop($id, 'BanTimestamp', time());
|
|
# Set the timestamp of the unban
|
|
$f2bdb->set_prop($id, 'UnbanTimestamp', time()+$opts{bantime});
|
|
}
|
|
|
|
die "An error occured while updating the firewall rules"
|
|
unless (system("/sbin/e-smith/signal-event fail2ban-update") == 0);
|
|
|
|
exit(0);
|
|
|