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/*
* Copyright 1989, 1990, 1991, 1992, John F. Haugh II
* All rights reserved.
*
* Permission is granted to copy and create derivative works for any
* non-commercial purpose, provided this copyright notice is preserved
* in all copies of source code, or included in human readable form
* and conspicuously displayed on all copies of object code or
* distribution media.
*/
#include <ctype.h>
#ifndef BSD
#include <string.h>
#include <memory.h>
#else
#include <strings.h>
#define strchr index
#define strrchr rindex
#endif
#include "config.h"
#ifndef lint
static char sccsid[] = "@(#)obscure.c 3.6 20:37:32 3/7/92";
#endif
extern int getdef_bool();
extern int getdef_num();
#ifdef NEED_STRSTR
/*
* strstr - find substring in string
*/
char *
strstr (string, pattern)
char *string;
char *pattern;
{
char *cp;
int len;
len = strlen (pattern);
for (cp = string;cp = strchr (cp, *pattern);) {
if (strncmp (cp, pattern, len) == 0)
return cp;
cp++;
}
return 0;
}
#endif
/*
* Obscure - see if password is obscure enough.
*
* The programmer is encouraged to add as much complexity to this
* routine as desired. Included are some of my favorite ways to
* check passwords.
*/
/*ARGSUSED*/
int obscure (old, new)
char *old;
char *new;
{
int i;
char oldmono[32];
char newmono[32];
char wrapped[64];
if (old[0] == '\0')
return (1);
if ( strlen(new) < getdef_num("PASS_MIN_LEN", 0) ) {
printf ("Too short. ");
return (0);
}
/*
* Remaining checks are optional.
*/
if ( !getdef_bool("OBSCURE_CHECKS_ENAB") )
return (1);
for (i = 0;new[i];i++)
newmono[i] = tolower (new[i]);
for (i = 0;old[i];i++)
oldmono[i] = tolower (old[i]);
if (strcmp (new, old) == 0) { /* the same */
printf ("No Change. ");
return (0);
}
if (palindrome (newmono, oldmono)) /* a palindrome */
return (0);
if (strcmp (newmono, oldmono) == 0) { /* case shifted */
printf ("Case changes only. ");
return (0);
}
if (similiar (newmono, oldmono)) /* jumbled version */
return (0);
if (simple (old, new)) /* keyspace size */
return (0);
strcpy (wrapped, oldmono);
strcat (wrapped, oldmono);
if (strstr (wrapped, newmono)) {
printf ("Rotated. ");
return (0);
}
/*
#define CRACKLIB_DICTPATH "/usr/local/lib/pw_dict"
*/
#ifdef CRACKLIB_DICTPATH
{
char *msg;
if (msg = (char *) FascistCheck(new, CRACKLIB_DICTPATH))
{
printf("Problem: %s. ");
return(0);
}
}
#else
#error /* You need to edit and uncomment the value of CRACKLIB_DICTPATH */
*** : this is a syntax error - it ought to balls up most compilers : ***
#endif /* CRACKLIB_DICTPATH */
return (1);
}
/*
* can't be a palindrome - like `R A D A R' or `M A D A M'
*/
/*ARGSUSED*/
int palindrome (old, new)
char *old;
char *new;
{
int i, j;
i = strlen (new);
for (j = 0;j < i;j++)
if (new[i - j - 1] != new[j])
return (0);
printf ("A palindrome. ");
return (1);
}
/*
* more than half of the characters are different ones.
*/
/*ARGSUSED*/
int similiar (old, new)
char *old;
char *new;
{
int i, j;
char *strchr ();
for (i = j = 0;new[i] && old[i];i++)
if (strchr (new, tolower (old[i])))
j++;
if (i >= j * 2)
return (0);
printf ("Too similiar. ");
return (1);
}
/*
* a nice mix of characters.
*/
/*ARGSUSED*/
int simple (old, new)
char *old;
char *new;
{
int digits = 0;
int uppers = 0;
int lowers = 0;
int others = 0;
int size;
int i;
for (i = 0;new[i];i++) {
if (isdigit (new[i]))
digits++;
else if (isupper (new[i]))
uppers++;
else if (islower (new[i]))
lowers++;
else
others++;
}
/*
* The scam is this - a password of only one character type
* must be 8 letters long. Two types, 7, and so on.
*/
size = 9;
if (digits) size--;
if (uppers) size--;
if (lowers) size--;
if (others) size--;
if (size <= i)
return 0;
printf ("Too Simple. Use a longer password, or a mix of upper\n");
printf ("and lower case letters and numerics. ");
return 1;
}
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