Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Tue, 16 Jun 2015 09:31:50 +0800
From: Kai Zhao <loverszhao@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: poor man's fuzzer

Hi Alexander,

I add two fuzz methods to your fuzz.pl. And also I ported it to mac OS X
to fuzz OpenCL and CUDA. The fuzz.pl and fuzz_mac.pl are attached.
You can also get it in my jumbo fork.

https://github.com/loverszhaokai/JohnTheRipper/tree/fuzzing/fuzz/script

I add ChangeCase and InsertDictionary method. ChangeCase will
change each char to upper case and lower case, it will also change all
chars to upper case and lower case. InsertDictionary will insert strings
before each char if the length of hash is less than 50, otherwise it will
inert strings before and after those chars: ".,:#$*". The inserted strings
are from dictionary, and I created an dictionary which is attached. The
strings in the dictionary is from the found bugs which is likely to trigger
bugs.

The InsertDictionary found one bug by insert long strings:

https://github.com/magnumripper/JohnTheRipper/issues/1434


Thanks,

Kai

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#!/usr/bin/perl -w

#
# Author: Alexander
# Email: solar@...nwall.com
# Date: 2015-06-05
#

#
# How to run
#
# ulimit -v 2097152; time ./fuzz_mac.pl /path/to/john format-name &> fuzz.log
#

use Errno;

# Processes per logical CPU
$factor = 4;

$workdir = 'run';
$pwfile = $workdir . '/pw';
$session = $workdir . '/s';
$pot = $workdir . '/pot';
$fuzz_method = "";

die unless (mkdir($workdir, 0700) || $!{EEXIST});

$ENV{'OMP_NUM_THREADS'} = '1';
setpriority(PRIO_PROCESS, 0, 19);

if (1 > $#ARGV || 2 < $#ARGV) {
	print "usage: ./fuzz.pl /path/to/john format-name [dictionary]\n";
	die;
}

$john_path = $ARGV[0];
$format_name = $ARGV[1];
$dictionary_file = "";

if (2 == $#ARGV) {
	$dictionary_file = $ARGV[2];

	#
	# Init dictionary file
	#
	open($dic_handler, "<", $dictionary_file)
		|| die "dictionary_file=$dictionary_file does not exist\n";
	while ($line = <$dic_handler>) {
		chomp $line;
		$dictionary[$#dictionary + 1] = $line;
	}
	close($dic_handler);
}


#
# Get all formats name
#
open(FORMATS, "$john_path --list=formats --format=$format_name |") || die;
while (<FORMATS>) {
	($line) = /^([ ,\w\d-]+)/;
	@words = split(/, /, $line);
	for ($i = 0; $i <= $#words; $i++) {
		$formats[$#formats + 1] = $words[$i];
	}
}
close(FORMATS);

#
# Get all test cases in each format
#
for ($i = 0; $i <= $#formats; $i++) {
	print "i=$i  ";
	print $formats[$i];
	print "\n";

	open(TESTS, "$john_path --list=format-tests --format=$formats[$i] |") || die;
	while (<TESTS>) {
		($f, $c) = /^([\w\d-]+)\t[^\t]+\t([^\t]+)\t/;
		if ($f && $c) {
			$fs[$#fs + 1] = $f;
			$cs[$#cs + 1] = $c;
		}
	}
	close(TESTS);
}

die unless ($#fs >= 0 && $#fs == $#cs);

printf "%u test vectors\n", $#fs + 1;

$total_cases = 0;

GetTotalCases();

print "Total cases: $total_cases\n\n";

$cpus = `sysctl -n hw.ncpu`;
chomp $cpus;
$cpus = 1 if (!$cpus);

print "$cpus CPUs\n";

$cpus *= $factor;

$cpu = 1;

for ($cpu = 0; $cpu < $cpus - 1; $cpu++) {
	last if (fork() == 0);
}

$from = int(($#fs + 1) * $cpu / $cpus);
$to = int(($#fs + 1) * ($cpu + 1) / $cpus) - 1;

$session .= "-$cpu";
$pot .= "-$cpu";
$pwfile .= "-$cpu";

$seq = 0;
$id = 0;


Fuzz();


sub GetTotalCases
{
	print "GetTotalcases ...\n";
	for ($t = 0; $t < $#fs; $t++) {
		$f = $fs[$t];
		$c = $cs[$t];
		$o = $c;

		print "\n";
		print "format        = $f\n";
		print "original hash = $o\n";

		$count = 4 * length($c);

		for ($i = 0; $i < length($c) - 1; $i++) {
			if (chr(vec($c, $i, 8)) =~ /[9\$*#]/) {
				$count--;
			}
		}
		$total_cases += $count;

		# Swap two adjacent chars
		if (length($c) > 1) {
			$count = length($c) - 1;
			for ($i = 0; $i < length($c) - 1; $i++) {
				if (vec($c, $i, 8) eq vec($c, $i + 1, 8)) {
					$count--;
				}
			}
		}
		$total_cases += $count;

		# Append many copies of the last char
		$total_cases += 5;

		# Change chars to upper/lower Case
		for ($i = 0; $i < length($c); $i++) {
			$char = chr(vec($c, $i, 8));
			if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
				$total_cases++;
			}
		}

		# Change all chars to upper Case
		# Change all chars to lower Case
		$total_cases += 2;

		print "total_cases=$total_cases\n";

		if (50 > length($c)) {
			# Insert strings before each char
			$total_cases += (1 + length($c)) * $#dictionary;
		} else {
			# Insert strings before and after these chars: ",.:#$*"
			$count = 0;
			for ($i = 0; $i < length($c); $i++) {
				if (chr(vec($c, $i, 8)) =~ /[,.:#\$*]/) {
					$count++;
				}
			}
			$total_cases += (2 * $count) * $#dictionary;
		}
		print "total_cases=$total_cases\n";
	}
}

#
# Fuzz hashes and run john with the mutated hashes
#
sub Fuzz
{
	for ($t = $from; $t <= $to; $t++) {
		$f = $fs[$t];
		$c = $cs[$t];
		$o = $c;

		print "\n";
		print "format        = $f\n";
		print "original hash = $o\n";

		$fuzz_method = "raw";
		Run();

	        print "\n";
	        print "->9\n\n";
		# Replace chars with '9'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('9');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with 9";
			Run();
			$c = $o;
		}

		print "\n";
		print "->\$\n\n";
		# Replace chars with '$'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('$');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \$";
			Run();
			$c = $o;
		}

		print "\n";
		print "->*\n\n";
		# Replace chars with '*'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('*');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \*";
			Run();
			$c = $o;
		}

		print "\n";
		print "->#\n\n";
		# Replace chars with '#'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('#');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \#";
			Run();
			$c = $o;
		}

		print "\n";
		print "swap two adjacent chars\n\n";
		# Swap two adjacent chars
		for ($i = 0; $i < length($c) - 1; $i++) {
			my $x = vec($c, $i, 8);
			vec($c, $i, 8) = vec($c, $i + 1, 8);
			vec($c, $i + 1, 8) = $x;
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Swap $i";
			Run();
			$c = $o;
		}

		print "\n";
		print "Append many copies of the last char\n\n";
		# Append many copies of the last char
		$j = 1;
		for ($i = 0; $i < 5; $i++) {
			print "j=$j\n";
			$c = $o . chr(vec($o, length($o) - 1, 8)) x $j;
			#print "new=$c\n";
			$fuzz_method = "Append $j last char";
			Run();
			$j *= ($j + 1);
		}

		ChangeCase();

		if ($dictionary_file eq "") {
		} else {
			InsertDictionary();
	        }
	}
}

#
# 1. Change each char to upper case and lower case
# 2. Change all chars to upper case and lower case
#
sub ChangeCase
{
	print "\nChangecase\n\n";

	$c =$o;

	# Change chars to Upper Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = uc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Change $i to uppper case";
			Run();
		}
		$c = $o;
	}

	print "\n";
	# Change chars to lower Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = lc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Change $i to lower case";
			Run();
		}
		$c = $o;
	}

	print "\n";
	# Change all chars to upper Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = uc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
		}
	}
	#print "new=$c\n";
	$fuzz_method = "Change all to upper case";
	Run();

	print "\n";
	# Change all chars to lower Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = lc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
		}
	}
	#print "new=$c\n";
	$fuzz_method = "Change all to lower case";
	Run();
}

#
# Insert strings from dictionary before each char
#
sub InsertDictionary
{
	print "\nInsertDictionary\n\n";

	$c =$o;

	if (50 > length($c)) {
		# Insert strings before each char
		for ($i = 0; $i <= length($c); $i++) {
			print "insert before pos=$i\n";
			for ($j = 0; $j <= $#dictionary; $j++) {
				$c = substr($c, 0, $i) . $dictionary[$j] . substr($c, $i);
				#print "new=$c\n";
				$fuzz_method = "Insert $dictionary[$j] before $i";
				Run();
				$c = $o;
			}
		}
	} else {
		# Insert strings before and after these chars: ",.:#$*"
		for ($i = 0; $i < length($c); $i++) {
			if (chr(vec($c, $i, 8)) =~ /[,.:#\$*]/) {
				print "insert before and after pos=$i\n";
				for ($j = 0; $j <= $#dictionary; $j++) {
					$c = substr($c, 0, $i) . $dictionary[$j] . substr($c, $i);
					#print "new=$c\n";
					$fuzz_method = "Insert $dictionary[$j] before $i";
					Run();

					$c = $o;
					$c = substr($c, 0, $i + 1) . $dictionary[$j] . substr($c, $i + 1);
					#print "new=$c\n";
					$fuzz_method = "Insert $dictionary[$j] after $i";
					Run();

					$c = $o;
				}
			}
		}
	}
}

#
# Run john
#
sub Run
{
	$id++;
	print "Trying  ID=$id  Total Cases=$total_cases\n";
	#print "Trying  ID=$id  Total Cases=$total_cases  format $f, hash $c\n";
	open(PW, "> $pwfile") || die;
	print PW "$c\n";
	close(PW);

	open(JOHN, "| $john_path --skip-self-tests --nolog --config=local.conf --encoding=raw --stdin --session=$session --pot=$pot --format=$f $pwfile") || die;
	print JOHN "wrong password " x10 . "one\n";
	print JOHN "two wrongs\n";
	print JOHN "wrong password three\n";
	close(JOHN);

	die if ($? == 256 || $? == 2 || $? == 15); # exit(1) or INT or TERM

	if ($? != 0) {
		open(LOG, ">> fuzz-err.log") || die;
		print LOG "fuzz method=$fuzz_method\n";
		print LOG "$f $c $?\n";
		close(LOG);

		open(SAMPLE, "> fuzz-sample-$f-$cpu-$seq") || die;
		print SAMPLE "$c\n";
		close(SAMPLE);
		$seq++;
	}
}


#!/usr/bin/perl -w

#
# Author: Alexander
# Email: solar@...nwall.com
# Date: 2015-06-05
#

#
# How to run
#
# ulimit -v 2097152; time ./fuzz.pl /path/to/john format-name &> fuzz.log
#

use Errno;

# Processes per logical CPU
$factor = 4;

$workdir = '/dev/shm/fuzz';
$pwfile = $workdir . '/pw';
$session = $workdir . '/s';
$pot = $workdir . '/pot';
$fuzz_method = "";

die unless (mkdir($workdir, 0700) || $!{EEXIST});

$ENV{'OMP_NUM_THREADS'} = '1';
setpriority(PRIO_PROCESS, 0, 19);

if (1 > $#ARGV || 2 < $#ARGV) {
	print "usage: ./fuzz.pl /path/to/john format-name [dictionary]\n";
	die;
}

$john_path = $ARGV[0];
$format_name = $ARGV[1];
$dictionary_file = "";

if (2 == $#ARGV) {
	$dictionary_file = $ARGV[2];

	#
	# Init dictionary file
	#
	open($dic_handler, "<", $dictionary_file)
		|| die "dictionary_file=$dictionary_file does not exist\n";
	while ($line = <$dic_handler>) {
		chomp $line;
		$dictionary[$#dictionary + 1] = $line;
	}
	close($dic_handler);
}

#
# Get all test vector
#
open(TESTS, "$john_path --list=format-tests --format=$format_name | shuf |") || die;
while (<TESTS>) {
	($f, $c) = /^([\w\d-]+)\t[^\t]+\t([^\t]+)\t/;
	if ($f && $c) {
		$fs[$#fs + 1] = $f;
		$cs[$#cs + 1] = $c;
	}
}
close(TESTS);

die unless ($#fs >= 0 && $#fs == $#cs);

printf "%u test vectors\n", $#fs + 1;

$total_cases = 0;

GetTotalCases();

print "Total cases: $total_cases\n\n";

$cpus = `grep -c ^processor /proc/cpuinfo`;
chomp $cpus;
$cpus = 1 if (!$cpus);

print "$cpus CPUs\n";

$cpus *= $factor;

for ($cpu = 0; $cpu < $cpus - 1; $cpu++) {
	last if (fork() == 0);
}

$from = int(($#fs + 1) * $cpu / $cpus);
$to = int(($#fs + 1) * ($cpu + 1) / $cpus) - 1;

$session .= "-$cpu";
$pot .= "-$cpu";
$pwfile .= "-$cpu";

$seq = 0;
$id = 0;


Fuzz();


sub GetTotalCases
{
	print "GetTotalcases ...\n";
	for ($t = 0; $t < $#fs; $t++) {
		$f = $fs[$t];
		$c = $cs[$t];
		$o = $c;

		print "\n";
		print "format        = $f\n";
		print "original hash = $o\n";

		$count = 4 * length($c);

		for ($i = 0; $i < length($c) - 1; $i++) {
			if (chr(vec($c, $i, 8)) =~ /[9\$*#]/) {
				$count--;
			}
		}
		$total_cases += $count;

		# Swap two adjacent chars
		if (length($c) > 1) {
			$count = length($c) - 1;
			for ($i = 0; $i < length($c) - 1; $i++) {
				if (vec($c, $i, 8) eq vec($c, $i + 1, 8)) {
					$count--;
				}
			}
		}
		$total_cases += $count;

		# Append many copies of the last char
		$total_cases += 5;

		# Change chars to upper/lower Case
		for ($i = 0; $i < length($c); $i++) {
			$char = chr(vec($c, $i, 8));
			if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
				$total_cases++;
			}
		}

		# Change all chars to upper Case
		# Change all chars to lower Case
		$total_cases += 2;

		print "total_cases=$total_cases\n";

		if (50 > length($c)) {
			# Insert strings before each char
			$total_cases += (1 + length($c)) * $#dictionary;
		} else {
			# Insert strings before and after these chars: ",.:#$*"
			$count = 0;
			for ($i = 0; $i < length($c); $i++) {
				if (chr(vec($c, $i, 8)) =~ /[,.:#\$*]/) {
					$count++;
				}
			}
			$total_cases += (2 * $count) * $#dictionary;
		}
		print "total_cases=$total_cases\n";
	}
}

#
# Fuzz hashes and run john with the mutated hashes
#
sub Fuzz
{
	for ($t = $from; $t <= $to; $t++) {
		$f = $fs[$t];
		$c = $cs[$t];
		$o = $c;

		print "\n";
		print "format        = $f\n";
		print "original hash = $o\n";

		$fuzz_method = "raw";
		Run();

	        print "\n";
	        print "->9\n\n";
		# Replace chars with '9'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('9');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with 9";
			Run();
			$c = $o;
		}

		print "\n";
		print "->\$\n\n";
		# Replace chars with '$'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('$');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \$";
			Run();
			$c = $o;
		}

		print "\n";
		print "->*\n\n";
		# Replace chars with '*'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('*');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \*";
			Run();
			$c = $o;
		}

		print "\n";
		print "->#\n\n";
		# Replace chars with '#'
		for ($i = 0; $i < length($c); $i++) {
			vec($c, $i, 8) = ord('#');
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Replace $i with \#";
			Run();
			$c = $o;
		}

		print "\n";
		print "swap two adjacent chars\n\n";
		# Swap two adjacent chars
		for ($i = 0; $i < length($c) - 1; $i++) {
			my $x = vec($c, $i, 8);
			vec($c, $i, 8) = vec($c, $i + 1, 8);
			vec($c, $i + 1, 8) = $x;
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Swap $i";
			Run();
			$c = $o;
		}

		print "\n";
		print "Append many copies of the last char\n\n";
		# Append many copies of the last char
		$j = 1;
		for ($i = 0; $i < 5; $i++) {
			print "j=$j\n";
			$c = $o . chr(vec($o, length($o) - 1, 8)) x $j;
			#print "new=$c\n";
			$fuzz_method = "Append $j last char";
			Run();
			$j *= ($j + 1);
		}

		ChangeCase();

		if ($dictionary_file eq "") {
		} else {
			InsertDictionary();
	        }
	}
}

#
# 1. Change each char to upper case and lower case
# 2. Change all chars to upper case and lower case
#
sub ChangeCase
{
	print "\nChangecase\n\n";

	$c =$o;

	# Change chars to Upper Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = uc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Change $i to uppper case";
			Run();
		}
		$c = $o;
	}

	print "\n";
	# Change chars to lower Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = lc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
			next if ($c eq $o);
			#print "new=$c\n";
			$fuzz_method = "Change $i to lower case";
			Run();
		}
		$c = $o;
	}

	print "\n";
	# Change all chars to upper Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = uc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
		}
	}
	#print "new=$c\n";
	$fuzz_method = "Change all to upper case";
	Run();

	print "\n";
	# Change all chars to lower Case
	for ($i = 0; $i < length($c); $i++) {
		$char = chr(vec($c, $i, 8));
		if ($char =~ /[a-z]/ || $char =~ /[A-Z]/) {
			$char = lc $char;
			vec($c, $i, 8) = vec($char, 0, 8);
		}
	}
	#print "new=$c\n";
	$fuzz_method = "Change all to lower case";
	Run();
}

#
# Insert strings from dictionary before each char
#
sub InsertDictionary
{
	print "\nInsertDictionary\n\n";

	$c =$o;

	if (50 > length($c)) {
		# Insert strings before each char
		for ($i = 0; $i <= length($c); $i++) {
			print "insert before pos=$i\n";
			for ($j = 0; $j <= $#dictionary; $j++) {
				$c = substr($c, 0, $i) . $dictionary[$j] . substr($c, $i);
				#print "new=$c\n";
				$fuzz_method = "Insert $dictionary[$j] before $i";
				Run();
				$c = $o;
			}
		}
	} else {
		# Insert strings before and after these chars: ",.:#$*"
		for ($i = 0; $i < length($c); $i++) {
			if (chr(vec($c, $i, 8)) =~ /[,.:#\$*]/) {
				print "insert before and after pos=$i\n";
				for ($j = 0; $j <= $#dictionary; $j++) {
					$c = substr($c, 0, $i) . $dictionary[$j] . substr($c, $i);
					#print "new=$c\n";
					$fuzz_method = "Insert $dictionary[$j] before $i";
					Run();

					$c = $o;
					$c = substr($c, 0, $i + 1) . $dictionary[$j] . substr($c, $i + 1);
					#print "new=$c\n";
					$fuzz_method = "Insert $dictionary[$j] after $i";
					Run();

					$c = $o;
				}
			}
		}
	}
}

#
# Run john
#
sub Run
{
	$id++;
	print "Trying  ID=$id  Total Cases=$total_cases\n";
	#print "Trying  ID=$id  Total Cases=$total_cases  format $f, hash $c\n";
	open(PW, "> $pwfile") || die;
	print PW "$c\n";
	close(PW);

	open(JOHN, "| $john_path --skip-self-tests --nolog --max-run-time=1 --encoding=raw --stdin --session=$session --pot=$pot --format=$f $pwfile") || die;
	print JOHN "wrong password " x10 . "one\n";
	print JOHN "two wrongs\n";
	print JOHN "wrong password three\n";
	close(JOHN);

	die if ($? == 256 || $? == 2 || $? == 15); # exit(1) or INT or TERM

	if ($? != 0) {
		open(LOG, ">> fuzz-err.log") || die;
		print LOG "fuzz method=$fuzz_method\n";
		print LOG "$f $c $?\n";
		close(LOG);

		open(SAMPLE, "> fuzz-sample-$f-$cpu-$seq") || die;
		print SAMPLE "$c\n";
		close(SAMPLE);
		$seq++;
	}
}

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