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|
#! /usr/bin/perl
#
# May need to change the path for perl above
#
# Tally example
# see the pam-tally module for details
#
my ($FILE,$deny,$lock_time, $unlock_time, $magic_root, $even_deny_root_account,
$retval)
= ("/tmp/pam-script-tally", 5, 5, 0, 0, 0, 0);
my ($fmt) = ("%-12s %3d %s %s\n");
our ($opt_h,$opt_L,$opt_t,$opt_l,$opt_r);
use Getopt::Std;
getopts('hLt:l:r:');
$| = 1; # flush output
$0 =~ s{^.*/}{}; # strip to basename
&usage() if defined $opt_h;
sub usage {
print <<EOF
$0 - pam-script example of pam-tally, which tracks
the number of failed logins and will lock out the person
if exceeds some threshold.
usage: $0 [-h][-L][[-t|-l|-r] user] \
[deny=N][lock_time=S][unlock_time=S][magic_root][even_deny_root_account]
where -h this usage info
-L list all the users
-t user tally entry for user
-l user list entry for user
-r user reset entry for user
these only apply if invoked from pam-script
deny=N number of failures before locking out
unlock_time=S number of seconds to deny access after a failure
magic_root don't tally the counter for root
even_deny_root_account
root is normally not locked out unless this is given
EOF
;
print q{version: $Id: tally,v 1.5 2007/09/07 15:24:45 rkowen Exp $},"\n\n";
exit
}
use Fcntl;
use SDBM_File;
umask 000;
tie (%tally, 'SDBM_File',$FILE, O_CREAT|O_RDWR, 0666)
or die "Could not tie SDBM file '$FILE': $!; aborting";
if (defined $opt_L) {
# show all users
foreach my $k (sort {$a cmp $b} keys %tally) {
my ($cnt, $sess, $auth) = &dget($tally{$k});
printf $fmt, $k, $cnt, &datetime($sess), &datetime($auth);
}
} elsif (defined $opt_t || defined $opt_l || defined $opt_r) {
my ($ocnt,$user) = (0,undef);
do {$ocnt++; $user = $opt_t;} if defined $opt_t;
do {$ocnt++; $user = $opt_l;} if defined $opt_l;
do {$ocnt++; $user = $opt_r;} if defined $opt_r;
die "Only one -t,-l, or -r option should be given"
if ($ocnt > 1);
$tally{$user} = &dset(0,0,0) if ! exists $tally{$user};
my ($cnt,$sess,$auth) = &dget($tally{$user});
$cnt=0 if ! defined $cnt;
$sess=0 if ! defined $sess;
$auth=0 if ! defined $auth;
if (defined $opt_t) {
$tally{$user} = &dset($cnt+1, time, time);
} elsif (defined $opt_r) {
$tally{$user} = &dset(0, $sess, $auth);
} elsif (defined $opt_l) {
printf $fmt,$user,$cnt,&datetime($sess),&datetime($auth);
}
} elsif ($0 =~ /^pam_script_auth$/ || $0 =~ /^pam_script_acct$/) {
foreach my $arg (@ARGV) {
$deny = $1 if ($arg =~ /^deny=(\d+)/);
$lock_time = $1 if ($arg =~ /^lock_time=(\d+)/);
$unlock_time = $1 if ($arg =~ /^unlock_time=(\d+)/);
$magic_root = 1 if ($arg =~ /^magic_root$/);
$even_deny_root_account = 1
if ($arg =~ /^even_deny_root_account$/);
}
# grab some PAM env.vars.
my $PAM_USER = $ENV{"PAM_USER"};
my ($cnt, $sess, $auth) = &dget($tally{$PAM_USER});
my $now = time;
if ($0 =~ /^pam_script_auth$/) {
# tally count
$retval = 1 if $cnt && ($now < $auth + $lock_time);
$cnt = 0 if ($cnt > $deny) && $unlock_time
&& ($now > $auth + $unlock_time);
$cnt++;
$cnt-- if $magic_root && $PAM_USER =~ /^root$/;
$retval = 1 if $cnt >= $deny;
$retval = 0 if ! $even_deny_root_account
&& $PAM_USER =~ /^root$/;
$auth = $now;
} elsif ($0 =~ /^pam_script_acct$/) {
$sess = $now;
$auth = $now;
$cnt = 0;
}
$tally{$PAM_USER} = &dset($cnt,$sess,$auth);
}
untie %tally;
exit $retval;
sub datetime {
my $time = shift;
return "unset" if !$time;
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)
= localtime($time);
return sprintf "%04d%02d%02d%02d%02d%02d", $year + 1900, $mon + 1,
$mday, $hour, $min, $sec;
}
sub dset {
my ($cnt,$sess,$auth) = @_;
return pack "ill", $cnt, $sess, $auth;
}
sub dget {
my $data = shift;
return unpack "ill", $data;
}
1;
|
