Port over the last of the tinylogin applets
-Erik
This commit is contained in:
Eric Andersen
246
libbb/obscure.c
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246
libbb/obscure.c
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/* vi: set sw=4 ts=4: */
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/*
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* Copyright 1989 - 1994, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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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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/*
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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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "libbb.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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static int palindrome(const char *old, const char *newval)
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{
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int i, j;
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i = strlen(newval);
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for (j = 0; j < i; j++)
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if (newval[i - j - 1] != newval[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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static int similiar(const char *old, const char *newval)
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{
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int i, j;
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for (i = j = 0; newval[i] && old[i]; i++)
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if (strchr(newval, 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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static int simple(const char *old, const char *newval)
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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; newval[i]; i++) {
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if (isdigit(newval[i]))
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digits++;
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else if (isupper(newval[i]))
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uppers++;
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else if (islower(newval[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 char *password_check(const char *old, const char *newval, const struct passwd *pwdp)
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{
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char *msg = NULL;
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char *oldmono, *newmono, *wrapped;
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if (strcmp(newval, old) == 0)
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return "no change";
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newmono = str_lower(xstrdup(newval));
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oldmono = str_lower(xstrdup(old));
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wrapped = (char *) 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 && similiar(oldmono, newmono))
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msg = "too similiar";
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if (!msg && simple(old, newval))
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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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bzero(newmono, strlen(newmono));
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bzero(oldmono, strlen(oldmono));
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bzero(wrapped, strlen(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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static char *obscure_msg(const char *old, const char *newval, const struct passwd *pwdp)
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{
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int maxlen, oldlen, newlen;
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char *new1, *old1, *msg;
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oldlen = strlen(old);
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newlen = strlen(newval);
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#if 0 /* why not check the password when set for the first time? --marekm */
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if (old[0] == '\0')
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/* return (1); */
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return NULL;
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#endif
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if (newlen < 5)
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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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/* Not for us -- Sean
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*if (!getdef_bool("OBSCURE_CHECKS_ENAB"))
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* return NULL;
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*/
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msg = password_check(old, newval, pwdp);
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if (msg)
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return msg;
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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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maxlen = 8;
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if (oldlen <= maxlen && newlen <= maxlen)
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return NULL;
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new1 = (char *) xstrdup(newval);
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old1 = (char *) 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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bzero(new1, newlen);
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bzero(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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extern int obscure(const char *old, const char *newval, const struct passwd *pwdp)
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{
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char *msg = obscure_msg(old, newval, pwdp);
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/* if (msg) { */
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if (msg != NULL) {
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printf("Bad password: %s.\n", msg);
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/* return 0; */
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return 1;
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}
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/* return 1; */
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return 0;
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}
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