[svn-upgrade] Integrating new upstream version, shadow (19990709)
This commit is contained in:
nekral-guest
286
libmisc/obscure.c
Normal file
286
libmisc/obscure.c
Normal file
@@ -0,0 +1,286 @@
|
||||
/*
|
||||
* Copyright 1989 - 1994, Julianne Frances Haugh
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <config.h>
|
||||
|
||||
#include "rcsid.h"
|
||||
RCSID("$Id: obscure.c,v 1.9 1999/03/07 19:14:40 marekm Exp $")
|
||||
|
||||
/*
|
||||
* This version of obscure.c contains modifications to support "cracklib"
|
||||
* by Alec Muffet (alec.muffett@uk.sun.com). You must obtain the Cracklib
|
||||
* library source code for this function to operate.
|
||||
*/
|
||||
|
||||
#include <ctype.h>
|
||||
#include <stdio.h>
|
||||
#include "prototypes.h"
|
||||
#include "defines.h"
|
||||
|
||||
#include "getdef.h"
|
||||
|
||||
/*
|
||||
* can't be a palindrome - like `R A D A R' or `M A D A M'
|
||||
*/
|
||||
|
||||
/*ARGSUSED*/
|
||||
static int
|
||||
palindrome(const char *old, const char *new)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
i = strlen (new);
|
||||
|
||||
for (j = 0;j < i;j++)
|
||||
if (new[i - j - 1] != new[j])
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* more than half of the characters are different ones.
|
||||
*/
|
||||
|
||||
/*ARGSUSED*/
|
||||
static int
|
||||
similar(const char *old, const char *new)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
/*
|
||||
* XXX - sometimes this fails when changing from a simple password
|
||||
* to a really long one (MD5). For now, I just return success if
|
||||
* the new password is long enough. Please feel free to suggest
|
||||
* something better... --marekm
|
||||
*/
|
||||
if (strlen(new) >= 8)
|
||||
return 0;
|
||||
|
||||
for (i = j = 0; new[i] && old[i]; i++)
|
||||
if (strchr(new, old[i]))
|
||||
j++;
|
||||
|
||||
if (i >= j * 2)
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* a nice mix of characters.
|
||||
*/
|
||||
|
||||
/*ARGSUSED*/
|
||||
static int
|
||||
simple(const char *old, const 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;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static char *
|
||||
str_lower(char *string)
|
||||
{
|
||||
char *cp;
|
||||
|
||||
for (cp = string; *cp; cp++)
|
||||
*cp = tolower(*cp);
|
||||
return string;
|
||||
}
|
||||
|
||||
static const char *
|
||||
password_check(const char *old, const char *new, const struct passwd *pwdp)
|
||||
{
|
||||
const char *msg = NULL;
|
||||
char *oldmono, *newmono, *wrapped;
|
||||
#ifdef HAVE_LIBCRACK
|
||||
char *dictpath;
|
||||
#ifdef HAVE_LIBCRACK_PW
|
||||
char *FascistCheckPw();
|
||||
#else
|
||||
char *FascistCheck();
|
||||
#endif
|
||||
#endif
|
||||
|
||||
if (strcmp(new, old) == 0)
|
||||
return "no change";
|
||||
|
||||
newmono = str_lower(xstrdup(new));
|
||||
oldmono = str_lower(xstrdup(old));
|
||||
wrapped = xmalloc(strlen(oldmono) * 2 + 1);
|
||||
strcpy (wrapped, oldmono);
|
||||
strcat (wrapped, oldmono);
|
||||
|
||||
if (palindrome(oldmono, newmono))
|
||||
msg = "a palindrome";
|
||||
|
||||
if (!msg && strcmp(oldmono, newmono) == 0)
|
||||
msg = "case changes only";
|
||||
|
||||
if (!msg && similar(oldmono, newmono))
|
||||
msg = "too similar";
|
||||
|
||||
if (!msg && simple(old, new))
|
||||
msg = "too simple";
|
||||
|
||||
if (!msg && strstr(wrapped, newmono))
|
||||
msg = "rotated";
|
||||
|
||||
#ifdef HAVE_LIBCRACK
|
||||
/*
|
||||
* Invoke Alec Muffett's cracklib routines.
|
||||
*/
|
||||
|
||||
if (!msg && (dictpath = getdef_str("CRACKLIB_DICTPATH")))
|
||||
#ifdef HAVE_LIBCRACK_PW
|
||||
msg = FascistCheckPw(new, dictpath, pwdp);
|
||||
#else
|
||||
msg = FascistCheck(new, dictpath);
|
||||
#endif
|
||||
#endif
|
||||
strzero(newmono);
|
||||
strzero(oldmono);
|
||||
strzero(wrapped);
|
||||
free(newmono);
|
||||
free(oldmono);
|
||||
free(wrapped);
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
/*ARGSUSED*/
|
||||
static const char *
|
||||
obscure_msg(const char *old, const char *new, const struct passwd *pwdp)
|
||||
{
|
||||
int maxlen, oldlen, newlen;
|
||||
char *new1, *old1;
|
||||
const char *msg;
|
||||
|
||||
oldlen = strlen(old);
|
||||
newlen = strlen(new);
|
||||
|
||||
#if 0 /* why not check the password when set for the first time? --marekm */
|
||||
if (old[0] == '\0')
|
||||
return NULL;
|
||||
#endif
|
||||
|
||||
if ( newlen < getdef_num("PASS_MIN_LEN", 0) )
|
||||
return "too short";
|
||||
|
||||
/*
|
||||
* Remaining checks are optional.
|
||||
*/
|
||||
if (!getdef_bool("OBSCURE_CHECKS_ENAB"))
|
||||
return NULL;
|
||||
|
||||
msg = password_check(old, new, pwdp);
|
||||
if (msg)
|
||||
return msg;
|
||||
|
||||
/* The traditional crypt() truncates passwords to 8 chars. It is
|
||||
possible to circumvent the above checks by choosing an easy
|
||||
8-char password and adding some random characters to it...
|
||||
Example: "password$%^&*123". So check it again, this time
|
||||
truncated to the maximum length. Idea from npasswd. --marekm */
|
||||
|
||||
if (getdef_bool("MD5_CRYPT_ENAB"))
|
||||
return NULL; /* unlimited password length */
|
||||
|
||||
maxlen = getdef_num("PASS_MAX_LEN", 8);
|
||||
if (oldlen <= maxlen && newlen <= maxlen)
|
||||
return NULL;
|
||||
|
||||
new1 = xstrdup(new);
|
||||
old1 = xstrdup(old);
|
||||
if (newlen > maxlen)
|
||||
new1[maxlen] = '\0';
|
||||
if (oldlen > maxlen)
|
||||
old1[maxlen] = '\0';
|
||||
|
||||
msg = password_check(old1, new1, pwdp);
|
||||
|
||||
memzero(new1, newlen);
|
||||
memzero(old1, oldlen);
|
||||
free(new1);
|
||||
free(old1);
|
||||
|
||||
return msg;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
int
|
||||
obscure(const char *old, const char *new, const struct passwd *pwdp)
|
||||
{
|
||||
const char *msg = obscure_msg(old, new, pwdp);
|
||||
if (msg) {
|
||||
printf(_("Bad password: %s. "), msg);
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user