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Security techniques every programmer should know

by Juerd (Abbot)
on Dec 26, 2004 at 22:47 UTC ( #417490=perlmeditation: print w/ replies, xml ) Need Help??

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  1. or download this
    use Encode qw(decode);
    use URI::Escape qw(uri_unescape);
    my $string = decode 'utf-8' => uri_unescape $input;
    
  2. or download this
    use Encode qw(encode);
    use HTML::Entities qw(encode_entities);
    my $output = encode_entities encode 'utf-8' => $string;
    
  3. or download this
    #!/usr/bin/perl -w
    
    ...
    
    print "Content-Type: text/html\n\n";
    print read_file "$page.html";
    
  4. or download this
    http://example.com/page.cgi?page=page.cgi%00blah!
    
  5. or download this
    $string =~ tr/\x00-\x09\x0b\x0c\x0e-\x1f//d;
    
  6. or download this
    #!/usr/bin/perl -wT
    
    ...
    
    print "Content-Type: text/html\n\n";
    print read_file "$page.html";
    

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