scan_passwd

来自「UNIX下perl实现代码」· 代码 · 共 31 行

#!/usr/bin/perl

# $RCSfile: scan_passwd,v $$Revision: 4.1 $$Date: 92/08/07 17:20:38 $

# This scans passwd file for security holes.

open(Pass,'/etc/passwd') || die "Can't open passwd file: $!\n";
# $dotriv = (`date` =~ /^Mon/);
$dotriv = 1;

while (<Pass>) {
    ($login,$pass,$uid,$gid,$gcos,$home,$shell) = split(/:/);
    if ($shell eq '') {
	print "Short: $_";
    }
    next if /^[+]/;
    if ($pass eq '') {
	if (index(":sync:lpq:+:", ":$login:") < 0) {
	    print "No pass: $login\t$gcos\n";
	}
    }
    elsif ($dotriv && crypt($login,substr($pass,0,2)) eq $pass) {
	print "Trivial: $login\t$gcos\n";
    }
    if ($uid == 0) {
	if ($login !~ /^.?root$/ && $pass ne '*') {
	    print "Extra root: $_";
	}
    }
}