Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [day] [month] [year] [list]
Date: Mon, 17 Mar 2008 04:53:07 +0300
From: Solar Designer <solar@...nwall.com>
To: john-users@...ts.openwall.com
Subject: DumbForce external modes for 8-bit characters

Hi,

Here are a couple of variations of the DumbForce external mode.  The
first one will try almost the entire 8-bit range, except for most risky
terminal control characters.  The other one differs in that it will skip
over lowercase letters, which is desirable when cracking LM hashes.

# Generic implementation of "dumb" exhaustive search, given a range of lengths
# and an arbitrary charset.  This is pre-configured to try 8-bit characters,
# which is only reasonable to do for very short passwords.
[List.External:DumbForce-8bit]
int maxlength;		// Maximum password length to try
int last;		// Last character position, zero-based
int lastid;		// Character index in the last position
int id[0x7f];		// Current character indices for other positions
int charset[0x100], c0;	// Character set

void init()
{
	int minlength;
	int i, c;

	minlength = 1;	// Initial password length to try, must be at least 1
	maxlength = 8;	// Must be at least same as minlength

/*
 * This defines the character set.
 *
 * Let's say, we want to try TAB, all non-control ASCII characters, and all
 * 8-bit characters, including the 8-bit terminal controls range (as these are
 * used as regular national characters with some 8-bit encodings), but except
 * for known terminal controls (risky for the terminal we may be running on).
 */
	i = 0;
	charset[i++] = 9;		// Add horizontal TAB (ASCII 9), then
	c = ' ';			// start with space (ASCII 32) and
	while (c <= 0x7e)		// proceed for all printable ASCII
		charset[i++] = c++;
	c++;				// Skip DEL (ASCII 127) and
	while (c < 0x84)		// proceed over 8-bit codes till IND
		charset[i++] = c++;
	charset[i++] = 0x86;		// Skip IND (84 hex) and NEL (85 hex)
	charset[i++] = 0x87;
	c = 0x89;			// Skip HTS (88 hex)
	while (c < 0x8d)		// Proceed till RI (8D hex)
		charset[i++] = c++;
	c = 0x91;			// Skip RI, SS2, SS3, DCS
	while (c < 0x96)		// Proceed till SPA (96 hex)
		charset[i++] = c++;
	charset[i++] = 0x99;		// Skip SPA, EPA, SOS
	c = 0xa0;			// Skip DECID, CSI, ST, OSC, PM, APC
	while (c <= 0xff)		// Proceed with the rest of 8-bit codes
		charset[i++] = c++;

/* Zero-terminate it, and cache the first character */
	charset[i] = 0;
	c0 = charset[0];

	last = minlength - 1;
	i = 0;
	while (i <= last) {
		id[i] = 0;
		word[i++] = c0;
	}
	lastid = -1;
	word[i] = 0;
}

void generate()
{
	int i;

/* Handle the typical case specially */
	if (word[last] = charset[++lastid]) return;

	lastid = 0;
	word[last] = c0;

	i = last;
	while (i--) {			// Have a preceding position?
		if (word[i] = charset[++id[i]]) return;
		id[i] = 0;
		word[i] = c0;
	}

	if (++last < maxlength) {	// Next length?
		id[last] = lastid = 0;
		word[last] = c0;
	} else				// We're done
		word = 0;
}

void restore()
{
	int i, c;

/* Calculate the current length and infer the character indices */
	last = 0;
	while (c = word[last]) {
		i = 0; while (charset[i] != c && charset[i]) i++;
		if (!charset[i]) i = 0;	// Not found
		id[last++] = i;
	}
	lastid = id[--last];
}

# Generic implementation of "dumb" exhaustive search, given a range of lengths
# and an arbitrary charset.  This is pre-configured to try 8-bit characters
# against LM hashes, which is only reasonable to do for very short password
# half lengths.
[List.External:DumbForce-LM]
int maxlength;		// Maximum password length to try
int last;		// Last character position, zero-based
int lastid;		// Character index in the last position
int id[0x7f];		// Current character indices for other positions
int charset[0x100], c0;	// Character set

void init()
{
	int minlength;
	int i, c;

	minlength = 1;	// Initial password length to try, must be at least 1
	maxlength = 7;	// Must be at least same as minlength

/*
 * This defines the character set.
 *
 * Let's say, we want to try TAB, all non-control ASCII characters, and all
 * 8-bit characters, including the 8-bit terminal controls range (as these are
 * used as regular national characters with some 8-bit encodings), but except
 * for known terminal controls (risky for the terminal we may be running on).
 *
 * Also, let's say our hashes are case-insensitive, so skip lowercase letters
 * (this is right for LM hashes).
 */
	i = 0;
	charset[i++] = 9;		// Add horizontal TAB (ASCII 9), then
	c = ' ';			// start with space (ASCII 32) and
	while (c < 'a')			// proceed till lowercase 'a'
		charset[i++] = c++;
	c = 'z' + 1;			// Skip lowercase letters and
	while (c <= 0x7e)		// proceed for all printable ASCII
		charset[i++] = c++;
	c++;				// Skip DEL (ASCII 127) and
	while (c < 0x84)		// proceed over 8-bit codes till IND
		charset[i++] = c++;
	charset[i++] = 0x86;		// Skip IND (84 hex) and NEL (85 hex)
	charset[i++] = 0x87;
	c = 0x89;			// Skip HTS (88 hex)
	while (c < 0x8d)		// Proceed till RI (8D hex)
		charset[i++] = c++;
	c = 0x91;			// Skip RI, SS2, SS3, DCS
	while (c < 0x96)		// Proceed till SPA (96 hex)
		charset[i++] = c++;
	charset[i++] = 0x99;		// Skip SPA, EPA, SOS
	c = 0xa0;			// Skip DECID, CSI, ST, OSC, PM, APC
	while (c <= 0xff)		// Proceed with the rest of 8-bit codes
		charset[i++] = c++;

/* Zero-terminate it, and cache the first character */
	charset[i] = 0;
	c0 = charset[0];

	last = minlength - 1;
	i = 0;
	while (i <= last) {
		id[i] = 0;
		word[i++] = c0;
	}
	lastid = -1;
	word[i] = 0;
}

void generate()
{
	int i;

/* Handle the typical case specially */
	if (word[last] = charset[++lastid]) return;

	lastid = 0;
	word[last] = c0;

	i = last;
	while (i--) {			// Have a preceding position?
		if (word[i] = charset[++id[i]]) return;
		id[i] = 0;
		word[i] = c0;
	}

	if (++last < maxlength) {	// Next length?
		id[last] = lastid = 0;
		word[last] = c0;
	} else				// We're done
		word = 0;
}

void restore()
{
	int i, c;

/* Calculate the current length and infer the character indices */
	last = 0;
	while (c = word[last]) {
		i = 0; while (charset[i] != c && charset[i]) i++;
		if (!charset[i]) i = 0;	// Not found
		id[last++] = i;
	}
	lastid = id[--last];
}

-- 
Alexander Peslyak <solar at openwall.com>
GPG key ID: 5B341F15  fp: B3FB 63F4 D7A3 BCCC 6F6E  FC55 A2FC 027C 5B34 1F15
http://www.openwall.com - bringing security into open computing environments

-- 
To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com and reply
to the automated confirmation request that will be sent to you.

Powered by blists - more mailing lists

Your e-mail address:

Powered by Openwall GNU/*/Linux - Powered by OpenVZ