b8d8d0de00
shadow-4.0.18.1-sha256.patch. Thanks to Peter Vrabec. Hardly no changes except re-indent and changes related to recent modifications (max_salt_len in crypt_make_salt). Changes in lib/defines.h not applied (definition of ENCRYPTMETHOD_SELECT). I will add a configure check or flag.
296 lines
6.6 KiB
C
296 lines
6.6 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#ifndef USE_PAM
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#ident "$Id$"
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/*
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* This version of obscure.c contains modifications to support "cracklib"
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* by Alec Muffet (alec.muffett@uk.sun.com). You must obtain the Cracklib
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* library source code for this function to operate.
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include "prototypes.h"
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#include "defines.h"
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#include "getdef.h"
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/*
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* can't be a palindrome - like `R A D A R' or `M A D A M'
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*/
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/*ARGSUSED*/ static int palindrome (const char *old, const char *new)
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{
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int i, j;
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i = strlen (new);
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for (j = 0; j < i; j++)
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if (new[i - j - 1] != new[j])
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return 0;
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return 1;
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}
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/*
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* more than half of the characters are different ones.
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*/
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/*ARGSUSED*/ static int similar (const char *old, const char *new)
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{
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int i, j;
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/*
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* XXX - sometimes this fails when changing from a simple password
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* to a really long one (MD5). For now, I just return success if
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* the new password is long enough. Please feel free to suggest
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* something better... --marekm
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*/
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if (strlen (new) >= 8)
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return 0;
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for (i = j = 0; new[i] && old[i]; i++)
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if (strchr (new, old[i]))
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j++;
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if (i >= j * 2)
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return 0;
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return 1;
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}
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/*
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* a nice mix of characters.
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*/
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/*ARGSUSED*/ static int simple (const char *old, const char *new)
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{
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int digits = 0;
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int uppers = 0;
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int lowers = 0;
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int others = 0;
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int size;
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int i;
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for (i = 0; new[i]; i++) {
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if (isdigit (new[i]))
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digits++;
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else if (isupper (new[i]))
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uppers++;
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else if (islower (new[i]))
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lowers++;
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else
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others++;
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}
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/*
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* The scam is this - a password of only one character type
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* must be 8 letters long. Two types, 7, and so on.
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*/
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size = 9;
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if (digits)
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size--;
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if (uppers)
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size--;
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if (lowers)
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size--;
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if (others)
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size--;
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if (size <= i)
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return 0;
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return 1;
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}
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static char *str_lower (char *string)
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{
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char *cp;
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for (cp = string; *cp; cp++)
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*cp = tolower (*cp);
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return string;
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}
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static const char *password_check (const char *old, const char *new,
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const struct passwd *pwdp)
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{
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const char *msg = NULL;
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char *oldmono, *newmono, *wrapped;
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#ifdef HAVE_LIBCRACK
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char *dictpath;
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#ifdef HAVE_LIBCRACK_PW
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char *FascistCheckPw ();
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#else
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char *FascistCheck ();
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#endif
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#endif
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if (strcmp (new, old) == 0)
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return _("no change");
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newmono = str_lower (xstrdup (new));
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oldmono = str_lower (xstrdup (old));
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wrapped = xmalloc (strlen (oldmono) * 2 + 1);
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strcpy (wrapped, oldmono);
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strcat (wrapped, oldmono);
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if (palindrome (oldmono, newmono))
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msg = _("a palindrome");
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if (!msg && strcmp (oldmono, newmono) == 0)
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msg = _("case changes only");
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if (!msg && similar (oldmono, newmono))
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msg = _("too similar");
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if (!msg && simple (old, new))
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msg = _("too simple");
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if (!msg && strstr (wrapped, newmono))
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msg = _("rotated");
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#ifdef HAVE_LIBCRACK
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/*
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* Invoke Alec Muffett's cracklib routines.
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*/
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if (!msg && (dictpath = getdef_str ("CRACKLIB_DICTPATH")))
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#ifdef HAVE_LIBCRACK_PW
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msg = FascistCheckPw (new, dictpath, pwdp);
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#else
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msg = FascistCheck (new, dictpath);
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#endif
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#endif
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strzero (newmono);
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strzero (oldmono);
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strzero (wrapped);
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free (newmono);
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free (oldmono);
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free (wrapped);
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return msg;
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}
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/*ARGSUSED*/
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static const char *obscure_msg (const char *old, const char *new,
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const struct passwd *pwdp)
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{
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int maxlen, oldlen, newlen;
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char *new1, *old1;
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const char *msg;
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#ifdef ENCRYPTMETHOD_SELECT
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char *result;
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#endif
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oldlen = strlen (old);
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newlen = strlen (new);
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if (newlen < getdef_num ("PASS_MIN_LEN", 0))
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return _("too short");
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/*
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* Remaining checks are optional.
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*/
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if (!getdef_bool ("OBSCURE_CHECKS_ENAB"))
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return NULL;
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msg = password_check (old, new, pwdp);
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if (msg)
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return msg;
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#ifdef ENCRYPTMETHOD_SELECT
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if ((result = getdef_str ("ENCRYPT_METHOD")) == NULL) {
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#endif
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/* The traditional crypt() truncates passwords to 8 chars. It is
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possible to circumvent the above checks by choosing an easy
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8-char password and adding some random characters to it...
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Example: "password$%^&*123". So check it again, this time
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truncated to the maximum length. Idea from npasswd. --marekm */
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if (getdef_bool ("MD5_CRYPT_ENAB"))
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return NULL;
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#ifdef ENCRYPTMETHOD_SELECT
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} else {
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if (!strncmp (result, "MD5" , 3) ||
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!strncmp (result, "SHA256", 6) ||
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!strncmp (result, "SHA512", 6))
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return NULL;
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}
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#endif
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maxlen = getdef_num ("PASS_MAX_LEN", 8);
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if (oldlen <= maxlen && newlen <= maxlen)
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return NULL;
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new1 = xstrdup (new);
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old1 = xstrdup (old);
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if (newlen > maxlen)
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new1[maxlen] = '\0';
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if (oldlen > maxlen)
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old1[maxlen] = '\0';
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msg = password_check (old1, new1, pwdp);
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memzero (new1, newlen);
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memzero (old1, oldlen);
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free (new1);
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free (old1);
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return msg;
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}
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/*
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* Obscure - see if password is obscure enough.
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*
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* The programmer is encouraged to add as much complexity to this
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* routine as desired. Included are some of my favorite ways to
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* check passwords.
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*/
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int obscure (const char *old, const char *new, const struct passwd *pwdp)
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{
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const char *msg = obscure_msg (old, new, pwdp);
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if (msg) {
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printf (_("Bad password: %s. "), msg);
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return 0;
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}
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return 1;
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}
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#endif /* !USE_PAM */
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